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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Current assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 10.6 | $ 7.5
Intangible Assets, accumulated amortization | $ 1,169.7 | $ 1,150.0
Limited partners: |  |
Capital account, units outstanding (in units) | 937,008,892 | 935,685,008

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